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Stock-Based Compensation (Summary of Activity Relating to Restricted Units) (Detail)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Restricted Units, Outstanding [Roll Forward]  
Closing market value of common stock | $ / shares $ 14.90
Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Purchase price for restricted units, vested | $ / shares $ 0.001
Number of Shares Underlying Restricted Units — Contingent Awards  
Restricted Units, Outstanding [Roll Forward]  
Outstanding at September 30, 2016 | shares 4,459,311
Weighted average remaining recognition period of outstanding restricted units 1 year 9 months
Unearned stock-based compensation expense of outstanding restricted units $ 63.5
Aggregate intrinsic value of outstanding restricted units(a) $ 66.4
Number of Shares Underlying Restricted Units — Time-Based Awards  
Restricted Units, Outstanding [Roll Forward]  
Outstanding at September 30, 2016 | shares 6,626,838
Weighted average remaining recognition period of outstanding restricted units 1 year 9 months
Unearned stock-based compensation expense of outstanding restricted units $ 73.4
Aggregate intrinsic value of outstanding restricted units(a) $ 98.8